CVE-2024-26678

In the Linux kernel, the following vulnerability has been resolved:
x86/efistub: Use 1:1 file:memory mapping for PE/COFF .compat section The
.compat section is a dummy PE section that contains the address of the
32-bit entrypoint of the 64-bit kernel image if it is bootable from 32-bit
firmware (i.e., CONFIG_EFI_MIXED=y) This section is only 8 bytes in size
and is only referenced from the loader, and so it is placed at the end of
the memory view of the image, to avoid the need for padding it to 4k, which
is required for sections appearing in the middle of the image.
Unfortunately, this violates the PE/COFF spec, and even if most EFI loaders
will work correctly (including the Tianocore reference implementation), PE
loaders do exist that reject such images, on the basis that both the file
and memory views of the file contents should be described by the section
headers in a monotonically increasing manner without leaving any gaps. So
reorganize the sections to avoid this issue. This results in a slight
padding overhead (< 4k) which can be avoided if desired by disabling
CONFIG_EFI_MIXED (which is only needed in rare cases these days)